Portable tire inflating unit



FIG. 1 is a perspective view taken from the front, top and right side of a portable tire inflating unit showing my new design;

FIG. 2 is a perspective view taken from the rear, bottom and right side thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof; and

FIG. 5 is a front elevational view thereof. 

The ornamental design for portable tire inflating unit, substantially as shown. 